It determines how many 12V batteries are needed to support the inverter for a specific backup duration.

Battery Quantity = Total Capacity Required (Ah) ÷ Single Battery Capacity (Ah)

Example: 3000W load, 4-hour backup, 48V system, 90% efficiency → total capacity ≈ 250Ah, using 12V 100Ah batteries → ~4–5 batteries in series/parallel.

How to Calculate 12V Battery Quantity?

• Identify Load Power (W): Total inverter output (3000W).

• Set Backup Hours: e.g., 4 hours.

• Select System Voltage: Usually 48V for home or small commercial.

• Account for Efficiency: Inverter & battery efficiency 85–95%.

• Calculate Total Capacity (Ah):
  Total Capacity = 3000 × 4 ÷ (48 × 0.9) ≈ 277Ah

• Determine Number of Batteries: Using 12V 100Ah → 4 in series for 48V.

Factors Affecting 12V Battery Quantity

• Load Variations: Higher or unstable loads require more batteries.

• Depth of Discharge (DoD): Higher DoD increases usable capacity but affects lifespan.

• Battery Chemistry: LFP batteries like 5kWh wall-mounted ESS or 144kWh air-cooled ESS offer long life and high efficiency.

• Cooling Method: Industrial or heavy-load scenarios may use liquid-cooled ESS, such as 215kWh or 3.35MWh containers, for efficiency and safety.

Applications

• Home Backup: Small inverters with 5–10kWh wall-mounted ESS.

• Commercial: 100–241kWh air-cooled ESS supports medium loads.

• Industrial: 372kWh liquid-cooled ESS powers large inverter systems.

• Utility & Renewable Projects: 3.35MWh liquid-cooled ESS container integrates with inverter stations.

Price

The cost depends on:

• Total capacity & system design

• Battery type (LFP/NMC)

• Cooling method

• Installation & logistics

Dagong ESS provides full-range solutions from home to large containers, with EXW, FOB, or CIF quotations tailored to project needs.

How to Choose the Right Number of 12V Batteries?

• Home: 4–5 × 12V 100Ah batteries for 48V system, or use 5–10kWh wall-mounted ESS directly.

• Commercial: 100–241kWh air-cooled ESS for medium loads.

• Large Industrial/Renewable: 3.35MWh liquid-cooled ESS container for high-capacity backup.

How to Choose the Right Number of 12V Batteries?

Home: 4–5 × 12V 100Ah batteries for 48V system, or use 5–10kWh wall-mounted ESS directly.

Commercial: 100–241kWh air-cooled ESS for medium loads.

Large Industrial/Renewable: 3.35MWh liquid-cooled ESS container for high-capacity backup.

How to Choose the Right Number of 12V Batteries?

Home: 4–5 × 12V 100Ah batteries for 48V system, or use 5–10kWh wall-mounted ESS directly.

Commercial: 100–241kWh air-cooled ESS for medium loads.

Large Industrial/Renewable: 3.35MWh liquid-cooled ESS container for high-capacity backup.

If you are interested in 12V battery calculation for a 3000W inverter and related ESS products, please contact Dagong ESS.
Email: sales@dagongess.com
Website: www.dagongess.com